Tag: biology

Questions Related to biology

Which of the following is the characteristic feature that distinguishes an algae from fungi?

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. Heterotrophic

  2. Autotrophic

  3. Parasitic

  4. Sporophytic

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Correct Option: B
Explanation:

The algae posses the chlorophyll pigments in the cells which allow these organisms to prepare the food by the process of photosynthesis. They are autotrophic because they can prepare the food on their own. The fungi are the heterotrophic or saprophytic organisms as they do not possess the chlorophyll pigments. They cannot prepare the food and depend on the other sources for food. 

Thus, the correct answer is option B. 

Which of the following microorganism is autotrophic in nature?

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. Algae

  2. Bacteria

  3. Fungi

  4. None of the above

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Correct Option: A
Explanation:

An organism that is capable of synthesizing its own food from inorganic substances using light or chemical energy is called as autotrophic organism. It includes green plants, algae and certain bacteria. Algae are photoautotrophs meanings they use light as the source of energy to prepare their food.

Thus, the correct answer is option A. 

Algae can grow

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. On the surface of water

  2. Inside the water

  3. On the tree

  4. None of the above

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Correct Option: A
Explanation:
Both macroalgae and microalgae need sunlight, water,chlorophyll, carbon dioxide, the correct environment and nutrients to grow and make their own energy. Macroalgae have air-bladders or flexible stipes which help the algae to rise to the surface of the water and catch the sunlight.

So, the correct answer is 'A'.

Which of the following statements is true about viruses?

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. Viruses are filterable facultative parasites

  2. Viruses are capable of performing metabolic activities on their own

  3. All viruses known to man are facultative parasites

  4. Some viruses have cellular structure and are saprophytes

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Correct Option: A
Explanation:

Viruses are obligate filterable parasites capable of independent existence and when they enter inside the body of the host they start utilising the host machinery for its own reproduction. 

Thus, the correct answer is option A. 

Make correct pair

A. Cyanophyceae                      b. Green colour
B. Chlorophyceae                     a. Blue green colour
C. Phaeophyceae                      d. Red colour
D. Rhodophyceae                     c. Brown colour

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. Aa, Bb, Cc, Dd

  2. Ab, Bc, Cd, Da

  3. Ab, Ba, Cd, Dc

  4. Ad, Bd, Ca, Db

Show answer
Correct Option: A
Explanation:
(A) Cyanophyceae - the blue green color is because of pigments phycobilins and phycocyanin, in addition to chlorophyll pigments
(B) Chlorophyceae  -The green colour is due to presence of a chl -a chl - b xanthophylls and carotenes 
(C) Phaeophyceae _ Brown colour is due to presence of pigment  fucoxanthin in addition to chlorophyll pigments
(D) Rhodophyceae _ Colour is red due to presence of r - pigment (r_phycoerythin) in addition to chlorophyll pigments
So, the correct answer is 'Aa, Bb, Cc, Dd'

Which of the following is the reason behind the autotrophic nature of algae?

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. It can carry out photosynthesis

  2. They depend on other animals for nutrition

  3. They are insectivores

  4. None of these

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Correct Option: A
Explanation:

The answer is option A "It can carry out photosynthesis"
Because organisms that carry out photosynthesis to make their own food are called autotrophic. Algae contain chlorophyll pigments which helps them to trap energy from sunlight to form glucose (food) on their own.
While option B represents a feature of heterotrophs and option C for carnivores that eat insects.

Which of the following is a microscopic plant?

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. Algae

  2. Fungi

  3. Bacteria

  4. None of the above

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Correct Option: A
Explanation:

Algae are single-celled, aquatic, microscopic plants. As they can make their own food, they are considered as plants. They contain photosynthetic pigment, chlorophyll-like plants. However, they do not have root, leaves and stems, unlike plants.

Thus, the correct answer is 'Algae'.

The agents which are known to cause Creutzfeldt-Jakob disease (CJD) are 

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. Protein particles

  2. A class of bacteria

  3. A class of viruses

  4. Fungi

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Correct Option: A
Explanation:

Creutzfeldt-Jakob disease (CJD) is caused by infectious protein particle called prions.

Which gives the green colour appearance to the pond?

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. Algae

  2. Grass

  3. Fertilizer

  4. None of the above

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Correct Option: A
Explanation:
Planktonic Algae bloom can appear as a paint-like scum on top of the water's surface. The water column turns green throughout and is often described as "pea soup."

So, the correct answer is 'Algae'.

Viruses that infects plants generally have

biology micro organisms non cellular organism : virus world of virus bacteria - introduction, shape and structure

  1. ds DNA

  2. ssRNA

  3. ds RNA

  4. ssDNA

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Correct Option: B
Explanation:

  • Approximately around 70% of viruses infecting plant are ssRNA, 20% are ssDNA and rest are either dsRNA or dsDNA.
  • ssDNA is advantageous due to it's ability to infect and duplicate it's genome faster.

So, the correct option is 'ssRNA'.